register and unregister shared preference change listener in MainActivity

Author: 314systems

app/src/main/kotlin/com/vrem/wifianalyzer/MainActivity.kt

@@ -65,7 +65,6 @@ class MainActivity :
         installSplashScreen()
         setContentView(R.layout.main_activity)
 
-        settings.registerOnSharedPreferenceChangeListener(this)
         optionMenu = OptionMenu()
 
         keepScreenOn()
@@ -80,9 +79,16 @@ class MainActivity :
 
         connectionView = ConnectionView(this)
 
+        settings.registerOnSharedPreferenceChangeListener(this)
+
         onBackPressedDispatcher.addCallback(this, MainActivityBackPressed(this))
     }
 
+    override fun onDestroy() {
+        MainContext.INSTANCE.settings.unregisterOnSharedPreferenceChangeListener(this)
+        super.onDestroy()
+    }
+
     public override fun onPostCreate(savedInstanceState: Bundle?) {
         super.onPostCreate(savedInstanceState)
         drawerNavigation.syncState()

app/src/main/kotlin/com/vrem/wifianalyzer/settings/Repository.kt

@@ -33,6 +33,10 @@ class Repository(
         onSharedPreferenceChangeListener: OnSharedPreferenceChangeListener,
     ): Unit = sharedPreferences().registerOnSharedPreferenceChangeListener(onSharedPreferenceChangeListener)
 
+    fun unregisterOnSharedPreferenceChangeListener(
+        onSharedPreferenceChangeListener: OnSharedPreferenceChangeListener,
+    ): Unit = sharedPreferences().unregisterOnSharedPreferenceChangeListener(onSharedPreferenceChangeListener)
+
     fun save(
         key: Int,
         value: Int,

app/src/main/kotlin/com/vrem/wifianalyzer/settings/Settings.kt

@@ -51,6 +51,10 @@ class Settings(
         onSharedPreferenceChangeListener: OnSharedPreferenceChangeListener,
     ): Unit = repository.registerOnSharedPreferenceChangeListener(onSharedPreferenceChangeListener)
 
+    fun unregisterOnSharedPreferenceChangeListener(
+        onSharedPreferenceChangeListener: OnSharedPreferenceChangeListener,
+    ): Unit = repository.unregisterOnSharedPreferenceChangeListener(onSharedPreferenceChangeListener)
+
     fun scanSpeed(): Int =
         repository.stringAsInteger(
             R.string.scan_speed_key,